OTHER WEBSITES/APPS TO AID YOUR LANGUAGE LEARNING
Memrise: My current favourite language learning tool, this memory based website/app drills the words into your brain and the courses are so much better designed than Duolingo ones for just casual conversation (when am I going to talk about classical music????)
Busuu: This is a good language learning device and to a extent it is free, but it is only good for learning languages that share the latin alphabet. Their Japanese course was a disaster when I did it, it expected me to memorise every character immediately when it gave you a phrase and never introduced you to the characters.
Hellotalk: this app is great for intermediate learners, when I use it I make sure that the other person is higher in English than I am lol. Great to actually speak to native speakers and the community is very good.
Put more in the comments to help language learners!
From the Duolingo Wiki:
Multilingual resources: http://duolingo.wikia.com/wiki/Multilingual_learning_resources
All language categories: http://duolingo.wikia.com/wiki/Category:Languages